PNI CommBoard - Manual (Page 15)

PNI Sensor Corporation DOC#1018122 r02
PNI CommBoard User Manual Page 13
This command will not remove the Hold state. Note that only capital „F‟ is
recognized.
? – Handshake Signal Status
The status of SSN and DRDY lines are returned to the user in a single byte. The
value of the byte indicates the status of these lines, as given in Table 5-3.
Table 5-3: Handshake Signal Status
Value SSN DRDY
0 LOW LOW
1 LOW HIGH
2 HIGH LOW
3 HIGH HIGH
! – Pulse CLEAR Signal
On receiving this command a 10 s pulse is generated on the CLEAR pin. This pin is
normally LOW.
$ – SSN Control
Issuing this command sets or resets the CommBoard‟s SSN line. The syntax is:
$#
where # must be “0” or “1”. The SSN pin will be set LOW if the number following
the „$‟ character is “0” and will be set HIGH if the number is “1”.
Example: x$0!wn113r~1rsi
This sentence asserts SSN LOW and writes “113” (decimal), then waits for
DRDY to go high, after which it reads a 16-bit signed integer. SSN is still LOW
at the end of the sentence.
.
– Pause 2 ms
Sending a “.” command causes a 2 ms delay before processing the next character in
the receive buffer. This is useful when working with the V2Xe.
V or v
– CPHA Setting
The SPI clock phase can be set by the user. “V” sets CPHA=1, “v” sets CPHA=0.
The default is “v”, CPHA = 0.
O or o – CPOL Setting
The SPI clock polarity can be set by the user. “O” sets CPOL=1, “o” sets CPOL=0.
The default is “o”, CPOL = 0.